function emailCheck (emailStr) {
        var emailPat=/^(.+)@(.+)$/;
        var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
        var validChars="\[^\\s" + specialChars + "\]";
        var quotedUser="(\"[^\"]*\")";
        var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
        var atom=validChars + '+';
        var word="(" + atom + "|" + quotedUser + ")";
        var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
        var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
        var matchArray=emailStr.match(emailPat);
        if (matchArray==null) {
            alert("Email address seems incorrect (check @ and .'s)");
            return false;
        }
        var user=matchArray[1];
        var domain=matchArray[2];
        if (user.match(userPat)==null) {
            alert("The username doesn't seem to be valid.");
            return false;
        }
        var IPArray=domain.match(ipDomainPat);
        if (IPArray!=null) {
              for (var i=1;i<=4;i++) {
                if (IPArray[i]>255) {
                    alert("Destination IP address is invalid!");
                return false;
                }
            }
            return true;
        }
        var domainArray=domain.match(domainPat);
        if (domainArray==null) {
            alert("The domain name doesn't seem to be valid.");
            return false;
        }
        var atomPat=new RegExp(atom,"g");
        var domArr=domain.match(atomPat);
        var len=domArr.length;
        if ((domArr[domArr.length-1] != "info") &&
            (domArr[domArr.length-1] != "name") &&
            (domArr[domArr.length-1] != "arpa") &&
            (domArr[domArr.length-1] != "coop") &&
            (domArr[domArr.length-1] != "aero")) {
                if (domArr[domArr.length-1].length<2 ||
                    domArr[domArr.length-1].length>3) {
                        alert("The address must end in a three-letter domain, or two letter country.");
                        return false;
                }
        }
        if (len<2) {
           var errStr="This address is missing a hostname!";
           alert(errStr);
           return false;
        }
        return true;
}
function UPTvalidateform(thisform)
{
	    if (thisform.val_67374.selectedIndex==0) { 
    alert("Please select a value for Enrollment year");
     return(true);}
	    if (emailCheck(thisform.email.value)) 
	    {	

            if (document.getElementById('unsubscribe') 
                && !document.getElementById('unsubscribe').checked) {
		        alert('Thank you for signing up!');
            } else {
                alert('Thank you for signing up!');
            }
		    return false;
	    }
	    else
	    {
		    return true;
	    }
}

 function clearDefault(el) {
				if (el.defaultValue==el.value) {
					el.value = ""}
 }